Historical clue formulations

• Tire patterns — 2024-12-23
• Bottoms of boots — 2024-10-06
• Steps — 2023-07-28
• Radial patterns — 2022-10-30
• Walks (on) — 2021-09-26
• Track makers — 2021-05-19
• Baldness is the result of losing them — 2020-06-27
• Pirelli patterns — 2016-06-22
• Puts one's foot down — 2013-03-30
• Radial patterns — 2009-11-04
• Steps (on) — 2008-04-01
• Risers meet them — 2007-10-05
• Track makers — 2003-02-09
• Radial surfaces — 2001-01-10
• Sneaker bottoms — 1998-03-22
• Firestone features — 1997-02-04
• Tire patterns — 1996-04-17